Packing



T. J. McGHATH.

PACKING.

APPLICATION FlLED NUV. 13. I919 1,333,001, Patented June 28, 1921.

Fig. I. Fig. 2.

Fig. 6.

Inventor,

ThomasJ. M i

His r ttornelj- PATENT OFFICE.

UNITED STATES 'rnoiius .1. McGRA'I'H, or scnEnEo'rAnY, NEW YORK, nssrsn'on 'ro GENERAL ELEC- TRIO comm, A conronn'rmn or mew YORK.-

PACKING.

Specification of Letters Patent.

Application filed November 13, 1919. Serial No. 337,804.

To all til/0177. it may cmwern- Be it known that I, THOMAS J. MoGnA'rn, a. citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful'lmprovements' in Pnckings, of which the following is a specification.

The present invention relates to paekings of the labyrinth type comprising a plural ity of axially extending interleaving rings, some of which carry rec ially extending, an nular projections which pack against the surfaces of adjacent rings thereby formin e tortuous passage to bnllle the How of fluid, the leakage of which it is desired to prevent. The object of my invention is to provide an improved method for making a packingelement for use in a acking of the above referred to type, and or a consideration of What I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

In the drawing, Figures 1 and 2 are views illustrating successive steps in the formation of a packing element, and Fig. 3 shows a complete packing made in accordance with m invention.

eferrin first to Fig. 3, fi-indirates :1 r0- tating sha. t which may be. for example. :1. shaft of an elastic-fluid turbine. and 6 indirates a wall having an opening 7 through which the shaft projects and between which and the shaft it is desired to prevent leakage. \Vall 6 may be. for example, a part of a turbine easing. Carried by shaft 5 are one or more sleeves 8 having axially spaced collars 9 thereon from which project roncentric radially spaced axially extending tim s 10. i

(llampcd between casing wall (3 and an inturned flange 11 on the outer end of u housing 12 are a number of packing elements each comprising :1 disk 12 located in a plane. sit right angles-to the shaft and provided at either one or both sides with :ixinlly projecting concentric rings H which interleave with rings i l. Housing lL' i fastened to wall (3 by suitable bolts 15 and disks iiare spa ed apart by means ohllungefi l3" which may he tor-med integral wi h (lhhS l3. (,.nrrieil by the outer edgesol' rings It and prir jci-ting on curb !-lllt thereof nn: thin packing strips {(1 The edges of strips lGtcrmmatc close to the surfaces of rings lfl and pit-ac against them. Strips l6 are made very thinthis connection it is pointed out that it is essential that strips 16 be accurately concentric and that they present very thin edges to the surfaces against which theypack. A packing of this type may be made.of any desired length by multiplying the number of racking elements nsed,'as is obvious.

. eeording to my invention, I take a. suitable piece of stock in the form of a disk (Fig. l) and cnl annular slots or rooves 20 in either one or both of its sur aces to form the projecting concentric radially spaced rings ll and the disk 13 which carries them. If there are to be rings 14 on both sides of disk .3 then grooves 2-0 are out on both sides as shown in Fig. 1. If. however. there are to be rings 14 on only one side then grooves '20 are cut on only one side.

It will be clear that grooves 20 can all be machined with a single setting of a piece of stock and that rings l4 will be accurately spaced and perfectly concentric.

Eitherat the. some time grooves 530 are being cut or after they have been cut I cut shallow grooves 21 in the. edges of rings 14 so us to provide two spaced parts 22 which are thin and sharp at their outer edges. After all the grooves 2i and 21 have been cut the original piece of stock has the appearance as shown in Fig. 1. A spae rg flange 15 is shown as being formed integral with the periphery of disk l3. Parts 2 5 :a re now turned outwardly by means of .-i suit able tool so the project at or substantially at right angles to rings ltthereby forming the 'irojei-ting pin-king: strips [6 referred to in connection with Fig. it. This then forms u complete packing element ro nprisiu g dish l l'with annular projecting rings 14 curried thereby nd having at their edges the concentric put-hing strips 16. As will be clear. all the operations in mu ing the parking element can he carri d out with a ingle set line of the piece of mat rial from which tile element is to be formed so that it need lh" c ntered but once. This menus that the groove 20 nd 21 will form rings l4 and parts 22 which are accuratcl com-cntric and that when parts 22 are turncd as shown in Fig. 2 to form the packing strips 16. the will be accurately concentric so as to pack correctly against the surfaces of rings 10. It will also be clear that collar 9 and thr rings 10 carried thereby may he formed from-a solid piece of stock having concentric grooves cut in its side face or faces so as to roi'ide rings 10.

fly following my improved method of manufacture, the strips 16 ca" readily be made as thin as found desirable and their edges can be made sharp. Furthermore. should at any time some of the strips 16 in the packing element become damaged, it is a comparatively simple matter to machine the damaged strip away and thereafter fasten a suitable strip to the ends of the ring or rings 14 in any of the ways which are now known and in use.

\Yhat I claim as new and desire to secure by Letters Patent of the United States, is

1. The method of making a packing clement which comprises taking a member having spaced projecting concentric rings thereon, machininp groorcs in the edges of said rings to form projecting parts, and then turning the said parts outwardly in opposite directions and at an angle to said rings.

2. The method of makin g a packing elc mcnt which compriscs taking a disk and um chiniu; spaccd grooms in the surfaces of it to form spaced ronrcntric rings, machining grooves in the ends of said rings to form thin. annular projccting parts at such ends, and turning said parts to an angle with the rings to form annular projccting parking strips.

3. The method of making a packing clement which compriscs taking a block of matcrial. l'ormin; spaced annular concentric groo'rcs in both side surfaces thereof to form ('uncclltlir rings. Inachinin; grooves in thc dges of said rings to form (him annular projecting parts, and lurnin said parts so they extend at an angle to said rings to form packing; strips.

in witness whcrcofi l have hereunto set my hand this 12th day of November, {919. 

